1904.] FROM EAST AFRICA AND ZANZIBAR. 279' 



DoRiDOPSis RUBRA (Kekait) A. & H. 



[A. & H., Notice of a Coll. of Nudib. Moll, made in India, p. 126 ;, 

 Bergh, Danish Exped. to Siam, Opisthobranchs, pp. 190-1.] 



This form is common both in Zanzibar and on the mainland. 

 The notes on the living animal describe it as a " Large bright red 

 Dorido2)sis, between crimson-lake and vermilion : the back above 

 the viscera blotched with small irregular spots of chocolate-brown. 

 Length two and a half inches, breadth at most two inches ; texture 

 of skin smooth and shiny ; body very contractile. GiUs 6, 

 feathery, tripinnate. Gills and rhinophores rapidly and completely 

 retractile." 



Six specimens are preserved, all much contracted and blistered. 

 Two are uniformly white ; in the rest the dark mottlings remain. 

 The skin is soft and smooth ; the mantle-edge fairly ample ; the 

 foot faii^ly wide and slightly pointed both before and behind. The 

 rhinophores are set very far in front and the branchiae very far 

 behind. The pockets of both have slightly raised smooth margins. 

 The branchiae are tripinnate, generally exposed, fairly luxuriant, 

 and apparently six in all specimens. No head or tentacles are 

 visible in any of the specimens, but while in the two white ones 

 the anterior margin of the foot appears to be simple, it is distinctly 

 grooved in the others. 



The internal organs are mostly of a reddish yellow and arranged 

 as usual in the genus. The mouth-gland is bilobed. From the 

 buccal cone issues a long thin tube about 1 mm. broad, which 

 is generally curved into the shape of S, and then dilates into a 

 wider portion, about 2 mm. broad, which is constricted before it. 

 enters the liver. The mouth-gland is bilobed, the eyes large and 

 distinct. The verge and part of the seminal duct are armed with 

 small hooks of a rather irregular shape. 



The difference of colour in the presem'ed specimens, coinciding 

 as it does with a somewhat different shape of the anterior pedal 

 mai-gin, suggests that the specimens may really belong to two 

 species, although the notes do not indicate an}"- difference in the 

 appearance of the living animals. Possibly D. rubra and D. hrockii, 

 as Bergh suggests, are merely varieties of a very variable form. 



Phyllidiad^. 



[See Bergh, " Bidr. til en Monogr. af Phyllidierne," Naturh. 

 Tidssk. 3 R. V. 1869; id. ISTeue Beitr. zur Kenntniss d. Phylli- 

 diaden, 1876 ; id. in S. R. xvi., xvii, Eliot, Nudibranchiata in 

 Gardiner's Fauna of Maldives and Laccadives, p. 560 ff.] 



The structure of these well-known and unmistakable animals 

 has been so thorougiily examined by Bergh that it need not be 

 described here. Five genera have been proposed: Phyllidia 

 (Cuv.) B., Phyllidiella B., Fryeria Gray, PhylUdiopsis B., and 

 Ceratophyllidia Eliot. The last thi-ee genera have all decided 

 characters. In Fryeria the vent is terminal and not dorsal ; in. 



